Border guards in the central province of Quang Tri Thursday said they caught two Lao men trying to cross into Vietnam with 4,300 tablets of a synthetic drug.

The tablets were found during body searches of Bun Voi, 67, and his son Bun Thui, 38, after they were caught illegally crossing the border on a motorbike Wednesday, according to the provincial Border Guards Headquarters.

The duo said they bought the drugs in Salavan Province and planned to sell them in Vietnam together with several locals.